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"a side of" equals "a side to"?

I come across the two sentences in a dictionary:
1. It was a side of Shari that I hadn't seen before.
2. There was a side to him that worried her, that seemed cold and cruel.
My question is, is "a side of" the same as "a side to" here? Can we change "of" to "to" in 1, and change "to" to "of" in 2?
Thank you very much.